PhysicsGravity's secret: How relativity meets quantum physics Some neat tricks with gravity could finally probe how it affects the quantum realm and allow us to devise a theory of everything, says Michael BrooksFeatures
LifeBorn to dance: The animals with natural rhythm Dogs and ducks are duds on the dance floor. So how come cockatoos and sea lions can move to a beat, and what does that tell us about our own musicality? Features